Finally found a reasonably educational channel on YouTube with respect to experimenting, tinkering and building - https://www.youtube.com/@MegawattKS

What caught my eye was this episode 
    NanoVNA and TinySA for Radio Design

which discusses the idea of building out a cheap RF lab at home which was not possible without the advent of small cheap test equipment like the NanoVNA and the tinySA.

The equipment covered here is:

Clearly a lot of stuff to look into - but first I need somem focus on what is the first step.